When Reese Witherspoon turns 36 this Thursday March 22, she'll definitely have something extra to celebrate: A baby on the way! As multiple sources confirm exclusively in the new Us Weekly, out now, the Oscar-winning actress is pregnant with her third child, and her first with second husband Jim Toth, who she wed last March at her $7 million ranch in Ojai, Calif. after over a year of dating.

"Reese is right around 12 weeks," one source explains of the This Means War star.

The baby-to-be will join older siblings Ava, 12, and Deacon, 8, Witherspoon's kids with first husband Ryan Phillippe, from whom she split in 2006 after 7 years of marriage. Pals of Witherspoon and high-powered CAA agent Toth, 41, aren't shocked by the happy news. "Reese and Jim have been trying to get pregnant," one pal says.

For much more on Witherspoon's pregnancy — how Ava, Deacon and their dad Ryan Phillippe reacted, how Toth is gearing up for first-time fatherhood and Witherspoon's plan for "time off" — pick up the new Us Weekly, on stands Friday!